Matthew Morrison is straight. Almost everybody seems to know that. Period. Paragraph.
I would say that he and the rest of the cast have not been making as much as you think for the first few seasons. It is Fox after all, which does not like to spend Rupert's blood money on laborers.
However with a 2 year pick-up, everybody's agent went back to the table, and I reckon now people are being paid close to what they are worth. (And who knows what the tour is paying them this summer and what kind of recording royalties the singers are getting?)
Big raise = new 1 mil+ house which was probably not paid for with cash and is mortgaged. If Glee goes away, as all shows do eventually, Matthew can sell presuming the housing market returns a bit.
I'd say the house is perfect for a single man with a hit series who doesn't know if he wants to stay in LA forever.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher